Velodyne DD-12

Original Owner. Includes complete original Accessory Kits, with measurement microphone, cables, manual, etc, for performing the Room Equalization / Optimization function.
This function allows you to fine-tune the bass response and get a clean, tight, solid, massive musical signal with great pitch definition, and blend in perfectly with your main speakers.
Price shown is for one unit, I have two available that I used in a stereo setup.

Description:
The 12 inch Digital Drive subwoofer produces awe-inspiring, hard-hitting bass supported by Velodyne's exclusive patented accelerometer based High Gain Servo System to whittle distortion down to .5%. Its cutting-edge, highly sophisticated, Auto-EQ technology assures not just low distortion but the most accurate bass available from any subwoofer available in the market today. And if you prefer, you can calibrate the subwoofer’s response with the parametric equalizer manually with its on-screen graphics. You can even adjust the degree of control by the digital servo. The DD-12 perfectly meshes audio engineering with the art of design to deliver a frequency response between 17 and 120 Hz, with a huge 1250 Watts RMS, 3000 Watts Dynamic, power amplifier, reproducing even the most challenging audio for applications from music to home theater to gaming. The 12 inch Digital Drive fills large listening spaces with room-shaking, hyper-accurate bass., perfectly optimized by the Auto-EQ equalizer feature and remote-controlled presets to ensure you get the most out of your new audio equipment.

Specifications:
Digital Drive DD-12 sealed-box powered subwoofer
Driver: 12" cone with 19.3-lb magnet structure, tandem 3" push-pull voice coil
Frequency response: 17–120Hz, +/-3dB
Harmonic distortion: <1% typical
Highpass crossover: 80Hz @ 6dB/octave
Lowpass crossover: 15–199Hz, variable in 1Hz increments; 6–48dB/octave slope
Subsonic filter: 15–35Hz, variable in 1Hz increments; 6–48dB/octave slope
Phase: 0–180°, variable in 15° increments
Amplifier output: 1250W RMS, 3000W peak
Inputs: line-level L&R, LFE (mono) line-level RCA, balanced XLR, speaker level L/R
Microphone: balanced XLR
Through (L&R): line-level RCA
EQ output: video, L&R
Other inputs/outputs: RS-232 in, RS-232 out
Dimensions: 14.5" x 14" x 15.5" (HxWxD)
Weight: 67 lbs